/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.openmessaging;

import io.openmessaging.extension.Extension;
import java.util.Optional;

/**
 * <p>
 * A {@code Client} interface contains all the common behaviors of producer and consumer. which can be used to achieve
 * some basic interaction with the server.
 * </p>
 *
 * @version OMS 1.0.0
 * @since OMS 1.0.0
 */
public interface Client {
    /**
     * Get the extension method, and this interface is optional, Therefore, users need to check whether this interface
     * has been implemented by vendors.
     * <p>
     *
     * @return the implementation of {@link Extension}
     */
    @io.openmessaging.annotation.Optional
    Optional<Extension> getExtension();
}
